Direct characterization of linear and quadratically nonlinear optical systems
Direct characterization of linear and quadratically nonlinear optical systems
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DOI：
10.1103/physreva.98.052327
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发表时间：
2018-01
影响因子：
2.9
通讯作者：
Kevin Valson Jacob;A. Mirasola;S. Adhikari;J. Dowling
中科院分区：
文献类型：
--
作者：
Kevin Valson Jacob;A. Mirasola;S. Adhikari;J. Dowling
量子信息处理的中心任务是描述量子过程。在光量子信息处理领域，这相当于表征模式创建和湮灭算子的变换。这种变换对于线性光学系统是酉的，而对于具有在模式算子中是二次的哈密顿算子的系统，这些变换产生了众所周知的Bogoliubov变换。在本文中，我们表明，修改后的马赫-曾德尔干涉仪可以表征这两种多模系统的演变。虽然它足以使用相干态的线性光学系统的特性，我们还需要单光子来表征二次非线性光学系统。
A central task in quantum information processing is to characterize quantum processes. In the realm of optical quantum information processing, this amounts to characterizing the transformations of the mode creation and annihilation operators. This transformation is unitary for linear optical systems, whereas these yield the well-known Bogoliubov transformations for systems with Hamiltonians that are quadratic in the mode operators. In this paper, we show that a modified Mach-Zehnder interferometer can characterize both these kinds of evolutions for multimode systems. While it suffices to use coherent states for the characterization of linear optical systems, we additionally require single photons to characterize quadratically nonlinear optical systems.